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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0722d774c59b44f137ca9238ab550d9228c90539c6fcc034dbdfd15c6bd51c' 
  AND token = 'dsVp6Uu6mKkJk9MbmSwEJJdE17+S9jWFGooieiPsj20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}